At first sight Krisztián Hofstädter’s OpenBCI setup with the Greentek Gelfree-S3 looks as if it would be a perfect setup for meditators:
Krisztián Hofstädter’s has written a PhD. thesis with the title:
‘Developing a Brain-Computer Music Interface for Meditation“
And his setup is interesting for people who are interested in meditation. But after Peter Gamma from the Meditation Research Institute Switzerland (MRIS) studied this and similar EEG heatsets for several years, he came to the conclusion that we have to be careful with this setup, especially with the Greentek Gelfree S3 cap. It raises expectations the device does not full-fill. The cap looks great, but what else has it to offer? The cap is only little developed, and the cap cost now on Aliexpress for $2,272 USD:
Greentek Gelfree S3 Electrode Hat Ag-AgCl Semi-Dry Saline Based EEG Headset for ERP, BCI and Neurofeedback
https://www.aliexpress.com/i/3256806080854166.html?gatewayAdapt=4itemAdapt
We have discussed the Greentek Gelfree S EEG cap several times on www.petergamma.org. This cap is risky for developers because of stock market speculation in scalping. Who wants to build a development onto a cap which has no stable price on the market?
Krisztián Hofstädter recently changed his look completely:
https://www.researchgate.net/profile/Krisztian-Hofstaedter
Has this something to do that he seems to have given up his OpenBCI projects and sarted somethin new which he entitles “Enhancing Audio Description”?
https://www.linkedin.com/in/krishofstadter
Isn’t it a pitty that his cap and his setup are not developed further? And is the turn in Krisztián Hofstädters scientific career not a pitty as well? Why does he not develop his OpenBCI setup further? Did it not stay on a superficial level and is little developed? For us personally, Krisztián Hofstädter’s OpenBCI setup with the Greentek Gelfree-S3 setup is little developed and expensive. Peter Gamma from www.petergamma.org:
misses an EEG headset from Krisztián Hofstädter or someone else with OpenBCI & the Greentek Gelfree S3 EEG cap which is developed in depth and has continuity. The Muse headband is also gel-free. Why is the Greentek Gelfree S3 EEG cap not used more, as a sort of a high-end Muse Headband? We know only little about this.
But the negative site of devices such as the BEATS 32 channel EEG device or the Greentek Gelfree S3 EEG is that they are given up by the developers, and we do not know why. Therefore we think it is better to inform you at a place like this:
https://infozentrum.ethz.ch/en
about the latest EEG cap technologies, before we waist your time with products which have been given up by the developer for unknown reasons. For instance the OpenBCI Galea uses new dry electrodes, and not gel-free electrodes, and there must be a reason for this. And we think it is better to find out about this topic in the scientific literature than from Krisztián Hofstädter who has a PhD. in building OpenBCI headsets for meditators. And also the 32 channel EEG headset from g.tec uses dry electodes, a headset which costs 50 000 USD. But we suppose we will find the latest dry electrodes sooner or later also on Aliexpress, to build our own headset for meditators.